From 723d65d543161171f01ca6d28129bb70b7e6ec99 Mon Sep 17 00:00:00 2001
From: Simon Tatham <anakin@pobox.com>
Date: Thu, 25 Oct 2001 12:48:13 +0000
Subject: Fixes to allow the text back end to wrap long headings. (These sound
 like a typographical Bad Plan, but they work OK in some types of document
 such as a FAQ.)

[originally from svn r1324]
---
 bk_text.c  | 60 ++++++++++++++++++++++++++++++++++++++----------------------
 buttress.h |  2 ++
 misc.c     |  3 +++
 3 files changed, 43 insertions(+), 22 deletions(-)

diff --git a/bk_text.c b/bk_text.c
index fb66dc6..73c4cea 100644
--- a/bk_text.c
+++ b/bk_text.c
@@ -458,42 +458,58 @@ static void text_heading(FILE *fp, word *tprefix, word *nprefix, word *text,
 			 alignstruct align, int indent, int width) {
     rdstringc t = { 0, 0, NULL };
     int margin, length;
+    int firstlinewidth, wrapwidth;
+    wrappedline *wrapping, *p;
 
     if (align.just_numbers && nprefix) {
 	text_rdaddwc(&t, nprefix, NULL);
 	rdaddc(&t, ' ');	       /* FIXME: as below */
-	margin = strlen(t.text);
     } else if (!align.just_numbers && tprefix) {
 	text_rdaddwc(&t, tprefix, NULL);
 	rdaddsc(&t, ": ");	       /* FIXME: configurability */
-	margin = strlen(t.text);
     }
-    text_rdaddwc(&t, text, NULL);
-
-    length = strlen(t.text);
+    margin = length = (t.text ? strlen(t.text) : 0);
 
-    if (align.align == LEFTPLUS)
+    if (align.align == LEFTPLUS) {
 	margin = indent - margin;
-    else if (align.align == LEFT)
-	margin = 0;
-    else if (align.align == CENTRE) {
-	margin = (indent + width - length)/2;
 	if (margin < 0) margin = 0;
+	firstlinewidth = indent + width - margin - length;
+	wrapwidth = width;
+    } else if (align.align == LEFT || align.align == CENTRE) {
+	margin = 0;
+	firstlinewidth = indent + width - length;
+	wrapwidth = indent + width;
     }
 
-    fprintf(fp, "%*s%s\n", margin, "", t.text);
-    if (align.underline != L'\0') {
-	char *u, uc;
-	wchar_t uw[2];
-	uw[0] = align.underline; uw[1] = L'\0';
-	text_convert(uw, &u);
-	uc = u[0];
-	sfree(u);
-	fprintf(fp, "%*s", margin, "");
-	while (length--)
-	    putc(uc, fp);
-	putc('\n', fp);
+    wrapping = wrap_para(text, firstlinewidth, wrapwidth, text_width);
+    for (p = wrapping; p; p = p->next) {
+	text_rdaddwc(&t, p->begin, p->end);
+	length = (t.text ? strlen(t.text) : 0);
+	if (align.align == CENTRE) {
+	    margin = (indent + width - length)/2;
+	    if (margin < 0) margin = 0;
+	}
+	fprintf(fp, "%*s%s\n", margin, "", t.text);
+	if (align.underline != L'\0') {
+	    char *u, uc;
+	    wchar_t uw[2];
+	    uw[0] = align.underline; uw[1] = L'\0';
+	    text_convert(uw, &u);
+	    uc = u[0];
+	    sfree(u);
+	    fprintf(fp, "%*s", margin, "");
+	    while (length--)
+		putc(uc, fp);
+	    putc('\n', fp);
+	}
+	if (align.align == LEFTPLUS)
+	    margin = indent;
+	else
+	    margin = 0;
+	sfree(t.text);
+	t = empty_rdstringc;
     }
+    wrap_free(wrapping);
     putc('\n', fp);
 
     sfree(t.text);
diff --git a/buttress.h b/buttress.h
index 934cca1..b07cf0a 100644
--- a/buttress.h
+++ b/buttress.h
@@ -279,6 +279,8 @@ struct tagRdstringc {
     int pos, size;
     char *text;
 };
+extern const rdstring empty_rdstring;
+extern const rdstringc empty_rdstringc;
 void rdadd(rdstring *rs, wchar_t c);
 void rdadds(rdstring *rs, wchar_t *p);
 wchar_t *rdtrim(rdstring *rs);
diff --git a/misc.c b/misc.c
index 7a1c59d..4243954 100644
--- a/misc.c
+++ b/misc.c
@@ -44,6 +44,9 @@ void *stk_pop(stack s) {
 /*
  * Small routines to amalgamate a string from an input source.
  */
+const rdstring empty_rdstring = {0, 0, NULL};
+const rdstringc empty_rdstringc = {0, 0, NULL};
+
 void rdadd(rdstring *rs, wchar_t c) {
     if (rs->pos >= rs->size-1) {
 	rs->size = rs->pos + 128;
-- 
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